Brake Device Leak Detection via Actuation Pressure Analysis
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Solution Overview
Problem
Conventional BBW type brake devices fail to rapidly detect leaks or blockages in the fluid path downstream of the slave cylinder, leading to delayed detection and potential safety issues.
Innovation Solution
The brake device incorporates actual operation amount detection, brake fluid pressure detection, deterioration determination, and control mechanisms to identify leaks or blockages by analyzing the actual amount of actuation and brake fluid pressure, allowing for immediate detection and adaptive control during normal and regenerative braking modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brake fluid level sensor is used to detect leaks downstream of the slave cylinder, then the system structure remains simple, but the leak detection is delayed until the brake fluid level decreases to a predetermined value or below
Solution Approach 1:
The system performs preliminary detection of leaks by monitoring the relationship between brake actuator actuation amount and brake fluid pressure before the brake fluid level decreases significantly. This allows early detection of leaks downstream of the cut-off valve by identifying deviations from expected pressure-actuation relationships, enabling timely intervention before the conventional level sensor would trigger.
Solution Approach 2:
The invention replaces the mechanical brake fluid level sensor detection method with an electronic monitoring system that uses sensors to detect brake fluid pressure and actuation amount, then processes this data electronically to determine leaks. This substitution enables continuous real-time monitoring rather than discrete level-based detection.
2Reliability
If the brake actuator is controlled in different modes based on deterioration state, then the braking safety is improved, but the control system complexity increases
Solution Approach 1:
The control system dynamically adjusts the brake actuator operation mode based on the detected deterioration state. When a leak or blockage is detected, the system transitions from normal control mode to a restricted control mode, adapting its behavior to the current system condition. This dynamic adaptation maintains safety while using a relatively simple control architecture.
Solution Approach 2:
The system implements feedback control by continuously monitoring the relationship between actuation amount and brake fluid pressure, comparing actual values against expected ranges, and adjusting control modes based on this feedback. The deterioration determination unit provides feedback about system health status that drives the control mode selection, creating a closed-loop safety mechanism.
Data Source
AI summary
A brake device for a vehicle is provided in which when a slave cylinder generates a brake fluid pressure that is commensurate with the actual amount of operation of a brake pedal by a driver in a state in which a master cut valve is closed and a fluid path connecting a master cylinder to the slave cylinder is cut off, a wheel cylinder is actuated by the brake fluid pressure. Since deterioration determination means determines a leak in the downstream of the slave cylinder based on the actual amount of actuation of the slave cylinder detected by a slave cylinder stroke sensor and the actual brake fluid pressure generated by the slave cylinder and detected by a fluid pressure sensor, it is possible to rapidly determine a leak in the downstream of the slave cylinder.